Nick Nolte is in negotiations to play a thoroughbred trainer in HBO’s upcoming series “Luck.”Series takes place in the world of horse racing, which is familiar turf for creator David Milch, who owns several horses. Last week, Dustin Hoffman was cast as the lead in “Luck”; John Ortiz and Dennis Farina had already been set to co-star. Nolte’s last prominent TV role was 34 years ago in the ABC miniseries “Rich Man, Poor Man.” Shooting is scheduled to begin in a few weeks, and HBO is aiming to get the drama on the air by early 2011. Michael Mann, who is directing the pilot, will also exec produce along with Milch and former HBO programming topper Carolyn Strauss. Henry Bronchtein (“The Sopranos”) is co-exec producer.